package com.example.larouzey.spinnertest201;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    private TextView tv;
    private Spinner sp;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        init();

        //定义数据源
        String[] cities={"北京","上海","大连","天津",};
        ArrayAdapter<String> adapter= new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,cities);
        adapter.setDropDownViewResource(
                android.R.layout.simple_spinner_dropdown_item
        );
        sp.setAdapter(adapter);
        sp.setPrompt("请选择城市");
        sp.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                tv.setText("您选择的是："+parent.getItemAtPosition(position).toString());
            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {

            }
        });
    }

    private void init(){
        tv=(TextView)findViewById(R.id.textView);
        sp=(Spinner)findViewById(R.id.spinner);
    }
}
